Gentlemen,
As long as you do not uninstall the previous version of your Infragistics controls, you do not have to uninstall Infragistics 2005 vol 1 in order to keep working with MM.NET.
MM.NET will not be able to use the latest controls but if you do not uninstall the previous version then you can continue to use MM.NET Infragistics Controls as normal as they will correctly reference the older controls.

Kevin, the instructions for updating the controls fails to mention that as the last step you must move the recompiled dll out of the Debug or Release folder and into the main Third Party Controls\Infragistics Windows Controls folder in order for it to be successfully referenced.

I did successfully update my Infragistics Controls to 2004 vol 3.02 but 2005 vol 1 fails to compile due to changes previously mentioned in my other postings.